Kazufumi (大瀬和文) Ose
Born : 1981 Cat. M45 Ultrarunner since 2013 JPN
70
DUV-index ?Largest integer N such that the runner has at least N credited races of at least N km.
73
DUV-index+ ?Largest integer N such that the race distances provide at least N complete segments of N km in total. A single long race may therefore contribute several segments. See the DUV-Index tab for the detailed calculation. calculation details
12
Countries visited ?AUSAustraliaCHNChinaCROCroatiaESPSpainFRAFranceGBRUnited KingdomHKGHong KongITAItalyJPNJapanKORSouth KoreaPORPortugalTPETaiwan
1,4%
Rank quotient ?This runner's calculation uses 93 eligible race(s): Σ(rank − 1) = 935; Σ finishers = 66 031. 935 / 66 031 × 100 = 1.42%. A win adds 0 to the numerator. Lower is better.

Totals

Ultras completed95
Km — ultra races8 935 km
> 100 km28
> 160 km16
Longest race170,3 km

Km per year (ultra races)

574
7 races
2022
586
6 races
2023
602
6 races
2024
534
6 races
2025
310
4 races
2026

Race types (share of distance)

Road5,7%
Trail91,4%
Stage2,9%

Wins & podiums (ultra)

🏆 Win18
🏆 Win M18
🏅 Top 344
🏅 Top 3 M44
Longest winning streak3
Current streak0

HISTORY

93 race(s)
DateRacePerf.Rk
2026
20.06 58km JPN2nd Kaga Spa by UTMB - Kaga Spa Trail Endurance 50 6:08:00 h8
06.06 52.4km JPN6th Okushinano 100 - 50 km 5:03:51 h2 🥈
17.05 100km JPN32th Yatsugatake Nobeyama 100 km 8:29:44 h4
24.01 100km HKG16th Hong Kong 100 Ultra Trail Race 12:30:03 h67
2025
12.10 71.5km JPN33th Hasetsune Cup - Japan Mountain Endurance Race 8:49:09 h7
13.09 162.2km JPN17th Shinetsu Five Mountains Trail 100 mile 23:05:58 h14
05.07 55km JPN3rd Shiga Kogen 55 5:22:01 h2 🥈
11.05 65km JPN18th Skyline Trail Sugadaira 6:34:33 h3 🥉
14.02 50mi HKG6th The 9 Dragons - 50 Miles 11:56:07 h1 🏆
18.01 100km HKG15th Hong Kong 100 Ultra Trail Race 12:41:52 h32
2024
13.10 71.5km JPN32th Hasetsune Cup - Japan Mountain Endurance Race 8:22:09 h12
14.09 163.1km JPN16th Shinetsu Five Mountains Trail 100 mile 21:14:42 h3 🥉
06.07 100km JPN2nd Shiga Kogen 100 12:43:45 h2 🥈
15.06 48km JPN3rd KTF Trail running race - Rockin Bear 4:35:41 h6
08.06 52.4km JPN4th Okushinano 100 - 50 km 4:59:03 h3 🥉
26.04 167km JPN9th Ultra-Trail Mt. Fuji 27:32:12 h66
2023
10.12 70km JPN10th Izu Trail Journey 7:00:02 h11
05.11 68km JPN7th Koshu Alps Haute Route Challenge 9:06:41 h1 🏆
08.07 100km JPN1st Shiga Kogen 100 12:27:47 h1 🏆
23.06 80km JPN2nd Deep Japan Ultra 100 - 80 km 9:19:46 h2 🥈
10.06 100.8km JPN3rd Okushinano 100 10:43:38 h3 🥉
21.04 167km JPN8th Ultra-Trail Mt. Fuji 26:50:57 h67
2022
11.12 70km JPN9th Izu Trail Journey 6:33:18 h5
06.11 101.9km JPN6th Koshu Alps Klesa 108 13:02:32 h2 🥈
09.10 71.5km JPN30th Hasetsune Cup - Japan Mountain Endurance Race 7:58:58 h3 🥉
17.09 162.6km JPN14th Shinetsu Five Mountains Trail 100 mile 20:13:36 h1 🏆
25.06 70km JPN1st Deep Japan Ultra 100 - 70 km 9:52:42 h1 🏆
12.06 53km JPN4th Yuzawa Sky Extreme Trail 6:33:58 h5
27.05 45km JPN1st Karuizawa Trail Running Race 4:33:34 h2 🥈
2021
26.11 100mi JPN1st TAMBA 100 Adventure Trail - 100mi 46:54:14 h8
14.11 56km JPN6th Nikko National Park Mountain Running 4:12:06 h2 🥈
28.08 75km JPN1st Okushinano 100 - 75 km 8:12:45 h9
23.07 65km JPN12th Nozawa Onsen 4100D Mountain Trail 6:30:16 h2 🥈
2020
29.12 130km JPN1st Kyoto Great Round 18:01:19 h1 🏆
13.12 66km JPN7th Izu Trail Journey 6:48:57 h17
2019
27.12 100mi HKG1st Golden 100 Hong Kong - 100 Mile Run 25:29:12 h3 🥉
30.11 104km TPE4th Formosa Trail 100km 14:06:15 h3 🥉
19.10 100km KOR1st Seoul Ultra Trail 100K 12:03:34 h1 🏆
12.10 110km KOR7th Transjeju Int. Trail Run 100 14:13:46 h3 🥉
15.09 110km JPN11th Shinetsu Five Mountains Trail 110km 12:07:19 h2 🥈
29.06 70km CHN4th The Grand Wutai Pilgrimage 7:59:08 h6
16.06 53km JPN5th Echigo Country Trail 4:41:53 h1 🏆
25.05 115km FRA8ème La Maxi Race du Lac d'Annecy - Ultra Race 14:54:02 h6
12.04 168km CRO7th 100 Miles of Istria 18:38:58 h1 🏆
01.03 100km HKG8th TransLantau 100 Ultra Trail 12:02:39 h1 🏆
02.02 130km/2stages HKG3rd The 9 Dragons - 50/50 17:34:28 h1 🏆
2018
15.12 100km HKG6th The North Face 100 Hong Kong 13:17:42 h4
14.09 52km GBR2nd Ben Nevis Ultra SkyRace 4:45:25 h39
29.08 119km ITA9ème Sur les Traces des Ducs de Savoie 16:04:14 h22
17.06 53km JPN4th Echigo Country Trail 5:11:26 h5
19.05 100km AUS11th Ultra-Trail Australia 100 km 9:58:10 h6
27.04 170km JPN5th Ultra-Trail Mt. Fuji 21:36:42 h6
24.02 130km/2stages HKG2nd The 9 Dragons - 50/50 18:18:30 h2 🥈
27.01 100km HKG8th Hong Kong 100 Ultra Trail Race 11:00:19 h18
2017
10.12 71.7km JPN4th Izu Trail Journey 7:16:08 h7
17.11 100km HKG36th Oxfam Trailwalker Hong Kong 13:26:30 h9
19.10 165.7km FRA25ème Grand Raid Réunion - La Diagonale des Fous 28:08:04 h21
08.10 71.5km JPN25th Hasetsune Cup - Japan Mountain Endurance Race 9:14:12 h19
01.07 80km JPN7th Utsukushigahara 80 km Trail Run 6:53:23 h3 🥉
25.06 72.7km JPN4. Spatrail - Shima to Kusatsu 7:15:27 h1 🏆
20.05 100km AUS10th Ultra-Trail Australia 100 km 10:08:06 h9
22.04 115km ESPVI. Penyagolosa Trail CSP-115 13:31:08 h8
11.03 50km HKG6th TransLantau 50 Ultra Trail 5:08:37 h1 🏆
04.02 50mi HKG1st The 9 Dragons - 50 Miles 10:48:09 h1 🏆
14.01 100km HKG7th Hong Kong 100 Ultra Trail Race 11:03:54 h16
2016
10.12 100km HKG4th The North Face 100 Hong Kong 16:02:32 h9
20.11 50km JPN1st Minami Alps Mountain Marathon 4:39:47 h4
29.10 85km POR6th IAU Trail WC Trans Peneda-Geres, Braga 9:49:27 h33
26.08 170km FRA14ème Ultra Trail Tour du Mont Blanc 32:11:05 h118
16.07 100mi JPN9th OSJ Ontake 100 Mile Ultra Trail 15:44:00 h1 🏆
24.06 82km FRA4ème 80km du Mont-Blanc 12:31:57 h13
28.05 50km JPN2nd Mt. Hiei Int. 50 km Trail Run 5:29:43 h1 🏆
24.04 70km JPN2nd Okumikawa Power Trail 7:47:06 h3 🥉
23.01 100km HKG6th Hong Kong 100 Ultra Trail Race 10:47:39 h7
2015
08.11 50km CHN1st Gobi Ultra-Marathon Jiuquan 3:42:49 h4
04.10 50km JPN9th Madarao Forest Trails 50km 4:23:22 h1 🏆
25.09 170.3km JPN4th Ultra-Trail Mt. Fuji 23:10:58 h6
28.08 170km FRA13ème Ultra Trail Tour du Mont Blanc 29:54:37 h98
04.07 80km JPN5th Utsukushigahara 80 km Trail Run 8:26:05 h4
06.06 100km JPN3rd Tokyo Shibamata 100 km 7:19:00 h2 🥈
16.05 100km AUS8th The North Face 100 Australia 10:28:20 h18
07.02 50km HKG3rd MSIG Sai Kung 50 5:55:15 h11
17.01 100km HKG5th Hong Kong 100 Ultra Trail Race 11:39:29 h11
2014
12.10 71.5km JPN22nd Hasetsune Cup - Japan Mountain Endurance Race 8:04:28 h15
05.10 50km JPN8th Madarao Forest Trails 50km 4:21:09 h2 🥈
29.08 168km FRA12ème Ultra Trail Tour du Mont Blanc 24:31:45 h23
15.06 81.4km JPN1. Spatrail - Shima to Kusatsu 7:56:27 h2 🥈
01.06 100km JPN2nd Tokyo Shibamata 100 km (Registered athletes) 7:38:22 h1 🏆
25.04 100mi JPN3rd Ultra-Trail Mt. Fuji 24:47:17 h21
2013
13.10 71.5km JPN21st Hasetsune Cup - Japan Mountain Endurance Race 8:15:07 h12
15.09 110km JPN5th Shinetsu Five Mountains Trail 110km 11:15:34 h3 🥉
07.09 100km JPN2nd OSJ Yatsugatake Super Trail 100 km race 9:44:36 h2 🥈
10.03 72km JPN1st Izu Trail Journey 6:46:55 h3 🥉